As far as I can tell, the QLED screens on the market are not based on the QLED technlogy that article is about, and the lifetimes given in that article are obviously far too low to build a usable television set with. They claim non-uniform degradation between different colours with blue in particular dropping to half the initial output after just 20 hours - that's nothing compared to the life of a TV set. Samsung QLED TVs seem to use standard LEDs in the backlight with a seperate quantum dot layer that improves colour accuracy and gamut.
It is the same technology. Samsung is just compensating the deficiency of Blue QD by using conventional Blue LEDs in their QLED TVs (creating white light with Green and Red QD as you wrote as well). The point is that the degradation of QD material still exists, and along with the usual degradation of the Blue LED, also the QD-material will degrade and shift over time.
The research paper describes the lifetime and degradation in a uniform setup, as it's research for foundational QD-tech, not for TV panels.
There's alot of research ongoing to improve QD lifetime as a foundation for new LED technology. Here's one from Dec.2022 [1], and one from as late as 2023 [2], all with the subject of solving performance stability of the technology to become on-par (!) with common LED.
